A NASCAR insider reveals how the brakes of the car he was driving lacked friction, which could have led to a serious accident before the Cup Series race.

The NASCAR Cup Series returns to Darlington Raceway in South Carolina for Sunday's Goodyear 400. The challenge of Darlington is three-pronged: tire management, the track and your own race car.

Denny Hamlin — winner: “There’s two people I really love right now: My pit crew and Kyle Larson. So had a little assist there so thank you. The pit crew just did an amazing job. They won it last week. They won it this week. It’s all about them.”